"What Our Gearhead® Experts Are Saying: ""I’ve worn this on hot, exposed hikes and the cooling tech is noticeable. The Omni-Freeze™ Zero Ice activates with sweat, which helps during long climbs, and the UPF 50 Sun Deflector adds extra protection in direct sun. It dries quickly, controls odor well, and the thumbholes are great for added coverage on exposed ridgelines."" When the trail stretches long under relentless sun, we trust this Columbia Titanium half-zip to keep us cool, dry, and moving strong. Built for high-output hiking in hot conditions, it’s designed to perform when shade is scarce and the miles keep stacking up. Omni-Freeze™ Zero Ice delivers sweat-activated cooling for lasting comfort in prolonged heat, while Omni-Shade™ Sun Deflector UPF 50 uses reflective dots to help block harmful UV rays and deflect sunlight. Omni-Wick™ pulls moisture away from the skin for quick-drying performance, and odor-neutralizing fabric keeps us feeling fresh from trailhead to summit. With 4-way stretch mobility, thumbholes for extra coverage, and an active fit that moves with us, this long-sleeve half-zip is built for the long haul."